So, you just drive with auto-tune activated, let it do whatever it does and then burn it before shut down?

After a while, does the VE table contour map smooth out?

Frank

You will not get to all the bins just driving about. Some of them you either set yourself or find varied terrain to load the engine.
Earlier I mentioned riding the brakes. This is used to vary the load to move up and down the KPAs when at a particular RPM. If you have a hill that you are pulling 110 KPA at 3500 Revs, the brakes can get you right up on boost long enough to get some more bins set.
You need to fill in the gaps and do some smoothing. Check it all after smoothing to be sure there is not some harmonic causing what looks to be an oddity.

Right - I have the EGO authority set to 50%, and I think the MS manual says to set it to no more than 10% to eliminate unstable jumps.

After the VE table is smooth, I suppose it will be time to adjust the AFR and Spark maps. One affects the other to a degree, so wouldn't I want do the AFR map first?

After the AFR map is tweaked a bit, is it desirable to generate a new VE table and auto-tune again?

Frank

The AFR is the guide for the autotune. If it is not what you want, the tune is useless. The only area that could really use fiddling are the high and low KPAs of the 1500 & 1750 bins. I would smooth the edges a bit in there.

That's one part of what I was getting at - if I wanted to try leaning it out around the low Kpa cruise bins, I would need to redo the auto-tune exercise. But then if I change the target AFR in the AFR table, I should rework the VE table so the EGO correction doesn't become too great - no, wait - I got it...... auto-tune does that for me. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Just when you think you understand it.... <img src="/forums/images/graemlins/lol.gif" alt="" /> It's like buying a car from a dealer.... you drive away chuckling about what a good deal you made, but before you even get home, you realize where HE got YOU. <img src="/forums/images/graemlins/lol.gif" alt="" />

Frank

Yup

Charlie, have you seen any of the MLS gaskets that don't seal well? In checking a few things today for the source of oil leaks, I found the underside of the passenger headgasket to have just a little oil on it - right at the rear lower corner. I don't think that's the big leak or oil would be all around that area.... it's just a small weep (I think). I don't know if it migrated there or not, but the front of the gasket seems dry.

I guess it's possible that when the timing belt snapped, it could have let an exhaust valve close and breach the gasket, but I'm a little doubtful..... more likely that the finish wasn't good enough for the MLS gasket. I can try to retorque it, but I don't know if it'll help.

What's your experience been with those gaskets? I'm trying to decide whether to try a redo on the pan or pull the engine and look it over really well. I'd hate to go to the trouble of redoing the pan and still have it leak and have to pull it anyway.

Frank

I have seen leaks with MLS gaskets. I have a slight coolant weep on my 3.8 now. And a few years ago on my Evo 3 swap I had a major oil leak. In that case I thought I had lost a piston since it was major smoke out the exhaust. Turns out the gasket had settled and the oil feed to the head ran right between layers into a cylinder. Once I understood the failure I washed the gasket, reinstalled it and pulled the torque up to 100 lbs. It is flawless now.
I expect on my 3.8 the DOHC heads were not smooth enough for the MLS gaskets. I might go in and pull the torque up a bit on them just to be sure the bolts are not settling.

I have the ARP 12mm head studs in mine and torqued them to 87 lb-ft with the ARP moly lubricant, assuming my torque wrench is correct - supposedly equal to ~110 lb-ft. I think I'll try going to 95 lb-ft without removing the head and see if that stops it..... it'll all have to wait until after Christmas, though.

Thanks,
Frank

Oh you arn't going out to start your Xmas shopping now are you? <img src="/forums/images/graemlins/smile.gif" alt="" />